PDF creation Graph time shift by +2h

CMK version: 1.6.0 p28
OS version: CentOS 7 x86_64

Error: When creating a custom timed PDF from a page the graph is shifted by 2h. F.ex: custom range from 4:00AM to 8:00AM results in a graph from 6:00AM to 10:00AM.

I know that there is a solution to this, but I can’t remember what it was. Last time I encountered tis error was like 2 years ago.

Does anybody know how to correct this graph issue?
Many thanks in advance

I have found the solution.
the problem was the missing / configuration of the apache.
the error was already solved here:

Sinse the Apache folder of checkmk 1.6.0p28 did not contain a php.ini file, I just copied the existing file from /etc and added the date.timezone entry.
After a restart of the site the error is gone.